WO2022236900A1 - Procédé de fusion à faible coût pour acier à usage polaire utilisant du fer fondu à teneur ultra-haute en phosphore - Google Patents

Procédé de fusion à faible coût pour acier à usage polaire utilisant du fer fondu à teneur ultra-haute en phosphore Download PDF

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WO2022236900A1
WO2022236900A1 PCT/CN2021/098736 CN2021098736W WO2022236900A1 WO 2022236900 A1 WO2022236900 A1 WO 2022236900A1 CN 2021098736 W CN2021098736 W CN 2021098736W WO 2022236900 A1 WO2022236900 A1 WO 2022236900A1
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steel
slag
smelting
converter
low
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PCT/CN2021/098736
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English (en)
Chinese (zh)
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麻衡
何康
王中学
王腾飞
邹稳蓬
杜传治
陈爱娇
张佩
宁伟
王月香
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莱芜钢铁集团银山型钢有限公司
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Priority to KR1020237006365A priority Critical patent/KR20230077719A/ko
Priority to US17/928,185 priority patent/US20230220504A1/en
Priority to EP21941469.5A priority patent/EP4215627A4/fr
Priority to JP2022574397A priority patent/JP7507895B2/ja
Publication of WO2022236900A1 publication Critical patent/WO2022236900A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C2007/0093—Duplex process; Two stage processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention belongs to the field of iron and steel metallurgy, and relates to a method for smelting low-phosphorus steel with ultra-high-phosphorus hot metal for polar steel.
  • Patent document CN 109593907 A published "a method for smelting low-phosphorus steel”. This patent produces finished products with P ⁇ 0.005% by controlling the converter blowing gun position, oxygen supply intensity, bottom blowing flow rate, and tapping slag control. Qualified slab, but this method is only applicable to molten iron with phosphorus content less than or equal to 0.10%.
  • Patent document CN 109897933 A announced "a high-efficiency smelting process for producing low-phosphorus clean steel by converter”. Slag treatment is easy to produce phosphorus back phenomenon, which is not suitable for ultra-high phosphorus hot metal smelting.
  • Patent document CN 109402323 A published "A Method for Smelting Ultra-low Phosphorus Steel by Ultra-high Phosphorus Hot Metal”. This patent optimizes the ratio of lime and slag modification agent in the LF refining process, and adjusts the composition of steel slag to increase the phosphorus content of steel slag. Capacity, thereby increasing the distribution ratio of phosphorus in steel slag and molten steel, providing favorable conditions for dephosphorization.
  • this smelting method does not describe the converter smelting process in detail, and the P content in the LF furnace in-situ molten steel is at a low level, and the LF refining process takes too long, which is not conducive to high-efficiency and low-cost mass industrial production.
  • the purpose of this application is to provide a low-cost smelting method for ultra-high phosphorus molten iron for polar steel, which can realize the requirement of using molten iron with a phosphorus content higher than 0.150% to smelt steel with a phosphorus content less than 0.007%, and can Significantly lower the ductile-brittle transition temperature of steel to meet the requirements of extreme cold conditions.
  • the present invention adopts the following technical solutions:
  • a low-cost smelting method of ultra-high phosphorus hot metal for polar steel comprising sequentially:
  • Converter smelting steps smelting, deoxidizing and tapping alloying of raw materials including molten iron;
  • LF refining step adjusting slag and refining the molten steel obtained in the converter smelting step to obtain refined molten steel
  • RH degassing step vacuum degassing the refined molten steel
  • Continuous casting step performing continuous casting on the molten steel obtained after the RH degassing step to obtain a cast slab.
  • the converter smelting step when the content of P element in the molten iron as raw material is ⁇ 0.15wt%, Si The content of the element is 0.15-0.6wt%, the content of the S element is ⁇ 0.006wt%, and the content of the As element is ⁇ 0.006wt%; preferably, the temperature of the molten iron is ⁇ 1230°C; if the temperature of the molten iron is too low, it may cause Molten steel back blowing is serious, large blowing damage, high consumption of steel material, high cost, no guarantee of molten steel quality, reduced furnace life and other problems.
  • the converter smelting step when the mass content of silicon in the molten iron used as a raw material is ⁇ 0.30%, the The raw material also includes scrap steel; preferably, the mass of scrap steel/(mass of molten iron + scrap steel) ⁇ 8%.
  • the double slag process specifically includes: step 1): adding a part of slag material to the raw material, and then using an oxygen lance to blow oxygen into the raw material until the primary slag is completely melted Finally, put the oxygen lance out of the converter and carry out slag dumping; step 2): use the oxygen lance to blow oxygen into the molten steel obtained in step 1), then add the remaining slag material in batches, continue smelting, and measure during the smelting process
  • lime or sinter is selected to be added according to the measurement results to ensure the basicity in the later stage and promote the penetration of slag.
  • the time from adding the remaining slag to measuring the TSC temperature and C content of the molten steel is 70-90s.
  • the total time for blowing oxygen (that is, the total reaction time of step 2)) is 240-300s.
  • the slag material includes a slagging agent and a coolant; preferably, the slagging agent is lime and dolomite; the coolant is sintered ore; preferably, in the step 1), the The addition amount of lime is 20-22.5kg/ton steel, the addition amount of described dolomite is 3.5-5.5kg/ton steel, the addition amount of described sintered ore is 28.5-32kg/ton steel;
  • the time for blowing oxygen is 5-6min;
  • step 1) after the primary slag has melted through, the oxygen lance is taken out of the converter within 15-30s;
  • the lime is added in an amount of 21-25kg/ton of steel
  • the dolomite is added in an amount of 3.5-5.0kg/ton of steel
  • the sintered ore The addition amount is 14-20kg/ton of steel
  • the TSC temperature is controlled at 1540°C-1590°C, and the carbon content is controlled at 0.25wt%-0.40wt%.
  • the lime is added to continue the oxygen blowing smelting; when the measured TSC ⁇ 1590°C, the sintered ore is added.
  • the lime or sintered ore is selected to be added to continue blowing, so as to ensure that the TSO temperature of the converter is controlled at 1600°C-1650°C, and the carbon content is controlled at 0.07%-0.09% %;
  • the TSO temperature of the converter is less than 1600°C, the temperature is raised by spot blowing.
  • the converter smelting step when the silicon content in the molten iron used as raw material is ⁇ 0.30wt%, the The raw materials are molten iron and scrap steel; preferably, the mass ratio of scrap steel to the raw material is ⁇ 8%.
  • a single slag process for smelting when the silicon content in the molten iron used as a raw material is less than 0.30%, a single slag process for smelting; preferably, the specific process of the single slag process is: step a) adding lime, sinter and dolomite to the raw materials, step b) waiting for the slag to be fully melted, measuring TSC, and then according to the measured TSC As a result, choose to add lime or sinter;
  • the lime is added in 2-3 batches, and the amount added per ton of steel is 42.9-46.2kg/t (that is, 42.9-46.2kg per ton of molten iron); preferably, the The sintered ore is added in 3-4 batches, and the amount added per ton of steel is 39.2-42.8kg/t; preferably, the dolomite is added in 2-3 batches, and the amount added per ton of steel is 8.57-10.7kg/t;
  • the lime or sinter is added in an amount of 2.15-3.57Kg per ton of molten iron; preferably, when the measured TSC ⁇ 1540°C, the lime is added Continue oxygen blowing smelting; when the measured TSC is ⁇ 1590°C, add sintered ore as a coolant to control the reaction rhythm.
  • step b) according to the measurement result of TSO, if the C content is greater than or equal to 0.10%, spot blowing is performed to control the C and P contents of the molten steel.
  • the converter smelting step nitrogen is blown at the bottom 7-8 minutes before smelting, wherein the nitrogen flow rate in the first 1-3 minutes is 450-580Nm 3 /h, the nitrogen flow rate increased to 800-900Nm 3 /h in the later stage (the volume of nitrogen is: the pressure is one atmosphere, the temperature is the gas volume at 0°C); 7-8 minutes after smelting bottom blowing nitrogen, switch to argon Gas, argon gas flow rate increased to 1000-1100Nm 3 /h.
  • the agitation of the molten pool is strengthened to promote the melting of lime and increase the speed of slagging; in the final stage of blowing, the agitation intensity of the molten pool is increased to promote the reaction balance of slag steel and strengthen the dephosphorization effect.
  • the converter smelting step when the carbon-oxygen product of the converter is ⁇ 0.0021, and the carbon at the end point of the converter measurement is ⁇ 0.045%, the direct output Steel; when the carbon and oxygen product of the converter is > 0.0032, the steel can only be tapped when the TSO composition of the converter is determined to be C: 0.06-0.09wt%, P ⁇ 0.006wt%, S ⁇ 0.020wt%; the carbon and oxygen product of the converter is 0.0021 When between -0.0032, the carbon at the furnace measurement end point needs to be ⁇ 0.045%, otherwise point blowing is carried out.
  • a high-low-low gun position (2000mm-1500mm-500mm) Nitrogen is used for slag splashing to protect the furnace.
  • the pressure gun is repeatedly lifted. After the slag splashes dry, the nitrogen is turned off and the gun is lifted.
  • the slag splashing time is 140-200s; Furnace slag splashing, and the thickness uniformity of slag splashing is good; compared with oxygen, a strong redox reaction will occur, which is not suitable for slag splashing to protect the furnace.
  • the price of argon gas is high, and the economy is poor.
  • the present invention can fully utilize The final slag with high alkalinity of the converter and the nitrogen by-product of the oxygen plant have low cost, and the invention directly adopts the oxygen lance to blow nitrogen and splash the slag to protect the furnace, which is easy to operate and high in efficiency.
  • the deoxidation is carried out by using ferro-aluminum manganese, and the addition amount of ferro-aluminum manganese is 1.7 -2.5kg/t steel.
  • the alloy used in the alloying includes: metal manganese, ferrosilicon, ferroniobium, vanadium Iron and nickel plates.
  • the substances used in the slag adjustment are aluminum slag and calcium carbide.
  • the slag adjustment also include lime; preferably, the slag is adjusted until the final slag alkalinity is ⁇ 2.2, and the top slag must be yellow and white slag or white slag before leaving the station, and the yellow and white slag or white slag must be kept for no less than 10 minutes.
  • the refining time is 30-45 minutes.
  • the vacuum degree is ⁇ 133Pa
  • the circulation time is not less than 15 minutes
  • the pure degassing time is greater than 5 minutes.
  • the superheat of the molten steel is controlled within 25°C.
  • the casting speed during continuous casting is 1.25-1.35m/min;
  • the casting speed is 1.2-1.4m/min;
  • the casting speed is 1.1-1.3m/min;
  • the casting speed is 0.85-0.95m/min;
  • the crystallizer in the above low-cost smelting method of ultra-high phosphorus molten iron for polar steel, as a preferred embodiment, in the continuous casting step, the crystallizer is covered with peritectic steel mold slag; the tundish is covered with a covering agent combined with carbonized rice husk , to ensure good coverage of the tundish liquid surface: the long nozzle of the tundish is sealed with argon, and the flow rate is 90-120L/min; if the flow rate is less than 90L ⁇ min, it is difficult to achieve the effect of isolating the air, and if the flow rate is >120L ⁇ min, argon is wasted .
  • the P content in the steel composition obtained by the smelting method is lower than 0.007%; more preferably, the The steel components obtained by the above smelting method include: C: 0.06-0.10%, Si: 0.20-0.35%, Mn: 1.5-1.65%, Nb: 0.010-0.030%, V: 0.010-0.035%, Ti: 0.010- 0.035%, Al: 0.015-0.040.
  • the method for smelting low-phosphorus steel with ultra-high-phosphorus molten iron for polar steels described in this application determines whether to adopt the double-slag process according to the silicon content of the molten iron. If the silicon content of the molten iron is ⁇ 0.30%, the converter smelting adopts the double-slag process; the silicon content of the molten iron is less than 0.30% % time: the converter adopts the single slag process, and then adopts the refining deep dephosphorization process for further dephosphorization.
  • This method can realize the continuous and stable smelting of steel with a phosphorus content of less than 0.007% using ultra-high phosphorus molten iron as raw material, and the consumption of auxiliary materials is relatively low , The production pace is fast, and it has broad prospects for promotion.
  • Smelting in single and double slag areas is distinguished according to the Si content of molten iron, which greatly saves the consumption of smelting raw materials, shortens the smelting cycle, and speeds up the production process.
  • the optimized slagging material ratio and reasonable oxygen blowing flow rate and oxygen blowing time are adopted to obtain ultra-low phosphorus hot metal through converter smelting.
  • the method for smelting low-phosphorus steel with ultra-high-phosphorus molten iron described in this application is relatively cheap, and the process is simple and easy to operate.
  • the slab-rolled steel plate produced by this smelting method is suitable for extreme cold conditions and has comprehensive properties. In demanding projects.
  • a method for smelting low-phosphorus steel with ultra-high phosphorus hot metal for polar steel :
  • a 140t top-bottom combined blowing converter is used, and the raw materials are composed of: 141t of high-phosphorus desulfurization molten iron (C: 5.65%, Mn: 0.213%, P: 0.151%, S: 0.002%, Si: 0.54%, AS : 0.0020%, molten iron
  • the temperature is 1310°C)
  • the double slag process is used for smelting. During the smelting, the oxygen is first lowered and blown, and the gun position is controlled at about 1500mm.
  • the flow rate of the oxygen lance is adjusted to about 25000m 3 /h, the lance position is at 1800mm, 3050kg of lime, 3600kg of sintered ore and 400kg of dolomite are added, and the first batch of materials is added 150s before the start of blowing.
  • the pressure gun is repeatedly lifted. After the slag splashes dry, the nitrogen lift gun is turned off.
  • the slag splashing time is 186s.
  • the carbon-oxygen product of the converter is ⁇ 0.0021 and the carbon at the end point of the converter measurement is ⁇ 0.045wt%
  • the steel is tapped, and the tapping temperature of the converter is 1620°C.
  • 260kg of ferro-aluminum manganese, 2100kg of metal manganese, 120kg of nickel plate, 60kg of ferro-vanadium, and niobium are added. 50kg of iron, 440kg of ferrosilicon; 600kg of synthetic slag and 200kg of pre-melted slag are added along the steel flow.
  • LF refining adds 200kg of lime, 200kg of fluorite, 50kg of calcium carbide, and 80kg of aluminum slag for slag adjustment; feeds 150m of aluminum wire to increase aluminum, and feeds 130m of titanium wire to increase titanium.
  • the basicity of the final slag is controlled above 2.2.
  • argon is blown and stirred at the bottom.
  • the argon pressure can be appropriately increased in the early stage, and soft blowing with low pressure is used before leaving the station to ensure that the inclusions float up.
  • the soft argon blowing time for refining is 5 minutes, and the overall refining time is 45 minutes.
  • the insertion depth of the dipping tube is 400mm; the vacuum degree during treatment is 30Pa, the circulation time is 22 minutes, and the pure degassing time is 10 minutes.
  • feed the calcium aluminum wire 90 meters per furnace, soft blow for 10 minutes, and the RH smelting cycle is 23 minutes.
  • the crystallizer is made of peritectic steel mold slag; the tundish is covered with a covering agent combined with carbonized rice husk to ensure good coverage of the liquid surface of the tundish.
  • the long nozzle of the ladle is sealed with argon, the flow rate is 90L/min, and the crystallizer adopts a non-sinusoidal vibration mode.
  • the section size of the continuous casting slab is 250mm*2400mm, and the casting speed is 1.1m/min.
  • the end condition of the heat is C: 0.07%, Si: 0.28%, Mn: 1.52%, P: 0.006%, S: 0.001%, Nb: 0.025%, Ti: 0.015%, V: 0.025%, Ni: 0.11%, Als: 0.020%; the furnace consumption is: lime 48.53kg/ton steel, total slag consumption 54.41kg/ton steel, oxygen consumption 47.05Nm 3 /ton steel.
  • the P content in the steel is all lower than 0.007wt%.
  • the yield strength of the steel plate is 425-510MPa
  • the tensile strength is 520-590MPa
  • the impact energy at -60°C is 150- 210J, reduction of area 22-32%.
  • a method for smelting low-phosphorus steel with ultra-high phosphorus hot metal for polar steel :
  • a 140t top-bottom combined blowing converter is used, and the raw material composition is: high-phosphorus desulfurization hot metal 92% (C: 4.437%, Mn: 0.213%, P: 0.148%, S: 0.003%, Si: 0.294%, AS : 0.0018%, The temperature of molten iron is 1316°C), and the balance is steel scrap.
  • the single slag process is adopted in the smelting process, and the position of the lance is controlled at about 1500mm when the oxygen lance is blown; after the oxygen lance is ignited, the flow rate of the oxygen lance is adjusted to about 26000m 3 /h, the lance position is at 1800mm, and the oxygen supply pressure is 0.8MPa ;8 minutes before smelting, nitrogen was blown at the bottom, the flow rate of nitrogen was 560m 3 /h, and then increased to 880m 3 /h, after 8 minutes of bottom blowing, it was switched to argon, and the flow rate increased to 1200m 3 /h, and 6200kg of sintered ore was added , 6040kg of lime, 800kg of dolomite, to ensure the alkalinity in the later stage and promote the penetration of slag; the position of the end gun is controlled at about 1200mm.
  • the high-low-low gun position (2000mm-1500mm-500mm) is used to protect the furnace by slag splashing.
  • the pressure gun is repeatedly lifted.
  • the nitrogen lift gun is turned off.
  • the slag splashing time is 163s.
  • the tapping temperature of the converter is 1646°C. 240kg of ferro-aluminum manganese, 2040kg of metal manganese, 120kg of nickel plate, 60kg of ferro-vanadium, 50kg of ferro-niobium, and 440kg of ferrosilicon are added during tapping; 600kg of synthetic slag and 200Kg of pre-melted slag are added along the steel flow.
  • 352kg of lime, 157kg of fluorite, 180kg of aluminum slag, and 20Kg of calcium carbide are added to LF refining for slag adjustment; 120m of aluminum wire is fed to increase aluminum, and 150m of titanium wire is fed to increase titanium.
  • the basicity of the final slag is controlled above 2.2.
  • the argon pressure can be appropriately increased in the early stage, and soft blowing with low pressure is used before leaving the station to ensure that inclusions float up.
  • the soft argon blowing time is 5 minutes, and the total smelting time is 42 minutes.
  • the insertion depth of the dipping tube is 400mm; the vacuum degree during treatment is 30Pa, the circulation time is 22 minutes, and the pure degassing time is 10 minutes.
  • 80 meters of calcium-aluminum wire is fed, soft blowing is performed for 10 minutes, and the RH smelting cycle is 22 minutes.
  • the crystallizer is made of peritectic steel mold slag; the tundish is covered with a covering agent combined with carbonized rice husk to ensure good coverage of the liquid surface of the tundish.
  • the long nozzle of the ladle is sealed with argon, the flow rate is 90L/min, and the crystallizer adopts a non-sinusoidal vibration mode.
  • the section size of the continuous casting slab is 300mm, and the casting speed is 0.85m/min.
  • the end condition of the heat is C: 0.07%, Si: 0.27%, Mn: 1.51%, P: 0.0065%, S: 0.001%, Nb: 0.026%, Ti: 0.015%, V: 0.026%, Ni: 0.12%, Als: 0.020%
  • the furnace consumption is: lime 47kg/ton steel, slag material consumption 51.5kg/ton steel, oxygen consumption 47.79Nm 3 /ton steel, steel material consumption 1.10t/ton steel.
  • the P content in the steel is all lower than 0.007wt%.
  • the yield strength of the steel plate is 440-500MPa
  • the tensile strength is 525-605MPa
  • the impact energy at -60°C is 130- 190J, reduction of area 23-29%.

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

L'invention concerne un procédé de fusion à faible coût d'acier à usage polaire utilisant du fer fondu à teneur ultra-haute en phosphore, le procédé comprenant séquentiellement les étapes suivantes : une étape de fusion par convertisseur consistant à réaliser une fusion, une désoxydation et un alliage d'acier sur des matières premières comprenant du fer fondu ; une étape de raffinage LF : la réalisation d'un conditionnement et d'un raffinage de laitier sur l'acier fondu obtenu dans l'étape de fusion par convertisseur pour obtenir un acier fondu raffiné ; une étape de dégazage RH : la réalisation d'un dégazage sous vide sur l'acier fondu raffiné ; et une étape de coulée continue : la réalisation d'une coulée continue sur l'acier fondu obtenu après l'étape de dégazage RH pour obtenir une ébauche coulée. Dans la présente invention, une fusion à zone de laitier simple et double différenciée par zone est exécutée sur la base de la teneur en Si du fer en fusion, limitant grandement la consommation de matière première pendant la fusion, raccourcissant la période de fusion et accélérant le processus de production.
PCT/CN2021/098736 2021-05-20 2021-06-07 Procédé de fusion à faible coût pour acier à usage polaire utilisant du fer fondu à teneur ultra-haute en phosphore WO2022236900A1 (fr)

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US17/928,185 US20230220504A1 (en) 2021-05-20 2021-06-07 Ultra-high phosphorus molten iron low-cost smelting method for polar steel
EP21941469.5A EP4215627A4 (fr) 2021-05-20 2021-06-07 Procédé de fusion à faible coût pour acier à usage polaire utilisant du fer fondu à teneur ultra-haute en phosphore
JP2022574397A JP7507895B2 (ja) 2021-05-20 2021-06-07 極地用鋼の超高リン溶銑低コスト製錬方法

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